1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
.TH MPI_Cart_create 3 "1/6/1997" " " "MPI"
.SH NAME
MPI_Cart_create \- Makes a new communicator to which topology information has been attached
.SH SYNOPSIS
.nf
#include "mpi.h"
int MPI_Cart_create ( comm_old, ndims, dims, periods, reorder, comm_cart )
MPI_Comm comm_old;
int ndims;
int *dims;
int *periods;
int reorder;
MPI_Comm *comm_cart;
.fi
.SH INPUT PARAMETERS
.PD 0
.TP
.B comm_old
- input communicator (handle)
.PD 1
.PD 0
.TP
.B ndims
- number of dimensions of cartesian grid (integer)
.PD 1
.PD 0
.TP
.B dims
- integer array of size ndims specifying the number of processes in
each dimension
.PD 1
.PD 0
.TP
.B periods
- logical array of size ndims specifying whether the grid is
periodic (true) or not (false) in each dimension
.PD 1
.PD 0
.TP
.B reorder
- ranking may be reordered (true) or not (false ) (logical)
.PD 1
.SH OUTPUT PARAMETER
.PD 0
.TP
.B comm_cart
- communicator with new cartesian topology (handle)
.PD 1
.SH ALGORITHM
We ignore
.I reorder
info currently.
.SH NOTES FOR FORTRAN
All MPI routines in Fortran (except for
.I MPI_WTIME
and
.I MPI_WTICK
) have
an additional argument
.I ierr
at the end of the argument list.
.I ierr
is an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with the
.I call
statement.
All MPI objects (e.g.,
.I MPI_Datatype
,
.I MPI_Comm
) are of type
.I INTEGER
in Fortran.
.SH ERRORS
All MPI routines (except
.I MPI_Wtime
and
.I MPI_Wtick
) return an error value;
C routines as the value of the function and Fortran routines in the last
argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error handler
may be changed with
.I MPI_Errhandler_set
; the predefined error handler
.I MPI_ERRORS_RETURN
may be used to cause error values to be returned.
Note that MPI does
.B not
guarentee that an MPI program can continue past
an error.
.PD 0
.TP
.B MPI_SUCCESS
- No error; MPI routine completed successfully.
.PD 1
.PD 0
.TP
.B MPI_ERR_TOPOLOGY
- Invalid topology. Either there is no topology
associated with this communicator, or it is not the correct type (e.g.,
.I MPI_CART
when expecting
.I MPI_GRAPH
).
.PD 1
.PD 0
.TP
.B MPI_ERR_DIMS
- Illegal dimension argument. A dimension argument
is null or its length is less than or equal to zero.
.PD 1
.PD 0
.TP
.B MPI_ERR_ARG
- Invalid argument. Some argument is invalid and is not
identified by a specific error class (e.g.,
.I MPI_ERR_RANK
).
.PD 1
.SH LOCATION
cart_create.c
|
